Underrated HP on 05-06 GTs


djs

GT Owner
Mark IV Lifetime
Jun 7, 2007
2,082
Sorry if this has been posted before, but I just saw it:

http://driving.ca/bmw/m5/auto-news/news/five-of-the-most-underrated-engines-and-their-true-power

Don’t think that underrating engines is something unique to the 1960s. The practice of saying your engine is less powerful than it actually is can still be used to full insurance companies. Ford rated the 5.4-litre supercharged V8 in the GT at 550 horsepower at the crank. This dyno test of a stock GT produced 562 horsepower at the wheels. This is a staggering number and other GT owners have reported stock cars producing 520 to 550 horsepower to the wheels. If we factor in a conservative 15% drivetrain loss, that means these engines are actually making around 630 horsepower!
 

Empty Pockets

ex-GT Owner
Mark IV Lifetime
Le Mans 2010 Supporter
Oct 18, 2006
1,361
Washington State
Sometimes 'sandbagging' has nothing to do with 'fooling insurance companies' :wink:

http://www.roadandtrack.com/motorsports/news/a28034/gt-sandbagging-daytona/
 

viva gt

GT Owner
Sep 15, 2010
419
toronto canada
mine came in at 535 rwhp, stock
 

GT Tech

Ford GT Team Alumni
Aug 13, 2006
678
Kingman, Arizona
Those numbers are really about right. The only thing that may be a little off is the parasitic loss through the trans. While common rules say 15% loss, the GT trans has about a 10% loss. This is from the Ricardo tech I worked with for a while.
 

KJRGT

GT Owner
Mark II Lifetime
May 4, 2006
2,840
SoCal
My stock GT pulled 557 RWHP on the Stillen chassis dyno.
 

ultrasportracing

GT Owner
Aug 31, 2011
490
Perth Western Australia
HP can vary from one dyno to another depends on how they are set up and operated.
 

STORMCAT

GT
Mark IV Lifetime
Le Mans 2010 Supporter
May 25, 2006
7,549
Ft. Lauderdale
Accu fab put a stock engine on their engine dyno years ago. I think it came it at 617 to 620 HP if I recall..
 

Ed Sims

GT Owner
Mark IV Lifetime
Apr 7, 2006
7,850
NorCal
My stock GT was in the 530s stock when it was dyno'd. Potential, as we all know, is the sky!

Ed
 

texas mongrel

GT Owner
Mark II Lifetime
May 3, 2009
1,661
Houston Texas
HP can vary from one dyno to another depends on how they are set up and operated.

Yup, I'm guessing a 50hp variation depending on type of dyno, make, and operator. My car made 614 fwhp on a German inertia dyno. Torrie commented that it would have been 650+ on a dynojet. There is always the temptation to show big numbers to keep the customer happy, but when using the dyno to tweak the tune the absolutes don't really matter; its all about improvements made from adjusting the tune
 

fjpikul

GT Owner
Mark IV Lifetime
Le Mans 2010 Supporter
Jan 4, 2006
11,475
Belleville, IL
What do you guys care? Red cars are the fastest.
 

Ed Sims

GT Owner
Mark IV Lifetime
Apr 7, 2006
7,850
NorCal
What do you guys care? Red cars are the fastest.

Only downhill!

Ed
 

bret a ewing

GT Owner
Nov 29, 2006
301
Thanks for the info.


Ford is careful never to repeat the '99 Mustang Cobra debacle.
 

Mullet

FORD GT OWNER
Le Mans 2010 Supporter
Oct 21, 2008
2,468
Houston Texas
What do you guys care? Red cars are the fastest.

throw 35lbs of boost at the engine......that will wake it up.